Cam-fastening for shafts of stamp-mills.



Patented Apr. I, I902.

E. BLANTUN, In. I CAM FASTENING FOR SHAFTS 0F STAMP MILLS.

(Applicsyion filed July 17, 1893.)

2 Sheets-Sheet I.

(No Model.)

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CAM FASTENING FOB SHAFTS 0F STAMP HILLS.

(Apflicdtion filed July 17, 1893.)

(N0 lflodgl.) 2 Sheets-Sheet 2.

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IlNrrnp drains EDWARD A. BLANTON, JR.,

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OF IVALLINGFORD, PENNSYLVANIA, ASSIGNOR TO BLANTON PATENTS SYNDICATE,LIMITED, OF

LONDON, ENGLAND.

CAM-FASTENING FOR SHAH-TS OF STAMP=WHLLS.

SPECIFICATION forming part of Letters Patent No. 696,403, dated April 1,1902.

Application filed July 17, 1893- Serial No. 480,745. (No model.)

To aZZ whom it may concern:

Be it known that I, EDWARD A. BLANTON, Jr., a citizen of the UnitedStates, residing at Wallingford, in the county of Delaware and State ofPennsylvania, have invented certain new and useful Improvements inCam-Fastenings for Shafts of Stamp-Mills, of which the following is aspecification, and for which I have obtained Letters Patent of GreatBritain, No. 11,071, dated June 6, 1893, and of the Transvaal, SouthAfrican Republic, No. 5&2, dated July 25, 1893.

This invention relates to an improvement in the devices employed forsecuring the cams of stamp-mills upon the shafts of the same, the objectbeing to provide a means by which the cams when worn out may be quicklyreplaced and securely held in position and to increase the life of theshaft; and my invention will be clearly understood by reference to theaccompanying drawings, taken in connection with the followingdescription.

In the drawings, Figure 1 is a View of a crank-shaft constructed inaccordance with myinvention. Fig. 2 is a cross-section of the shaft onthe line was, Fig.1. Fig. 3 is an end elevation of the shaft on asmallerscale, showing one of the cams applied thereto. Fig. 4: is asimilar view with parts broken away to illustrate myinvention. Fig. 5 isan end elevation of the wedge, shown detached from the shaft. Fig. 6 isa side view of the same, and Fig. 7 is a diagrammatic View showing oneway of making the same.

In carrying out my invention I forge or otherwise form upon the shaft aa number of bosses or wedges 1) corresponding to the number of cams tobe carried by the shaft, such bosses being arranged around the shaft inthe o requisite order to suit the positions to which it is desired thecams shall be set on the shaft. In the eye of each cam c is also formeda corresponding recess d, the boss or wedgeon the shaft and the recessin the eye of the cam being at the beginning or starting-pointtangential, or nearly so, to the surface of the shaft and the circle ofthe eyeof the cam, respectively, and extending thence rearwardlyrelatively to the direction of rotation a suitable distancecircumferentially on graduallyincreasing radii, so as to constitute acircumferential wedge or boss on the shaft and wedgecavity in the eye ofthe cam.

In describing the wedges as extending circumferentially ongradually-increasing radii I use the term broadly; but in all cases theouter face or surface of the boss or Wedge is upon a curve the radii ofwhich measured from the center of the shaft gradually increase. Thus theouter face or surface of the wedge may be on a true eccentric, as in theform or species indicated in the diagram Fig.

7, in which the outer surface of the wedge is made toconform to a curvem, the center of which'm is eccentric from the center a of the shaft a,so that, practically speaking, the radii of the curve m, taking thecenter of the shaft as a basic point, gradually increase. In all casesthe outer surfaces of the bosses or wedges and the inner surfaces of thecamre- 7o cesses or wedge-cavities have, broadly speaking,gradually-increasing radii when measured from the center of the shaft,and the outer surfaces of the bosses or wedges correspond to theoutlines of the inner surfaces of the cam-recesses, so as to make aclose fit.

When the wedges are made separate from the shaft, as illustrated moreparticularly in Figs. 4 to 6, the inner curved surfaces of the wedgescorrespond to the outer curvature of the shaft, so that they fit closelythereon, and they are provided with lugs or projections e on the thickends thereof, which fit into corresponding openings formed in the shaft,so that when the wedges are applied they are 8 prevented from shiftingaround the shaft not only by the friction between the surface of theshaft and the inner surfaces of the wedges, but by the additionalresistance furnished by the lugs or projections c. In cam-fastenings 0especially for use in stamp-mills it is desirable and indeed necessarythat the cams shall always be held in certain definite or well-definedrelations to each other, for if one or more of the cams is out of itsproper position the 5 stamps will not follow each other in their regularorder of drop, and if, for instance, by the shifting or slipping of thecams on the shaft two stamps drop near together they are liable to causea splash in the battery, which may Ioo Wash the gold or amalgam off theplate, and by my construction I find that when the bosses or wedges areonce properly adjusted the cams will retain their proper relations toeach other, and it is practically impossible for them to work slack, andno amount of use has any deleterious effects on the parts nor interferesin the slightest with the capacity of the device for keeping tight.Further, it will be seen that by my construction the contacting facesbetween the shaft and the bearing-socket of the cam do not exceed asemicircle, and this is an important feature in the application of thecams to the shaft. Each cam'is adj nsted by sliding it lengthwise to aposition over the boss or wedge while inclined forward slightlyrelatively to the direction in which the cam is to be turned, and thefact that the bearing-face for the shaft in the socket of the cam doesnot exceed a half-circle permits the cam to he slid freely over theshaft, the shaft playing in the eccentric portion of the opening untilthe boss or wedge is reached,when it is slid over the boss or wedge, andby a sharp thrust in the direction opposite to the rotation of the camit is made tight thereon and thereafter is kept tight by the reactingeffect of the thrust of the cam on the tappets of the stamp-rods, whilea blow of a hammer, for instance, on the end of one of the horns of thecam in the reverse direction slackens it when required. Further, it willbe noticed that the bosses or wedges are of a width corresponding to thewidth of the hub of the cam and extend circumferentially around theshaft somewhat less than a semicircle, and thus they form a largebearingsurface both on the shaft and on the face of the recess in thehub. This not only furnishes a substantial and practical bearing, butalso equalizes the bursting stress around the hub,'as the stress isdistributed throughout the circumferential range of the hub and the hubhas a bearing 'either on the shaft or wedge, except for a short space atone or both ends of the wedge.

What I claim is 1. The combination with a shaft,of a curved wedgesecured against rotation thereon and having an outer face upon a curvethe radii of which measured from the center of the shaft graduallyincrease, and a hub with an opening corresponding in part with andbearing on the face of the shaft and in part with and bearing on theentire outer face of the wedge, substantially as described.

2. The combination with a shaft,of a curved wedge secured againstrotation thereon and having an outer face upon a curve the radii ofwhich measured from the center of the shaft gradually increase, and ahub with an opening, a portion of which, not exceeding a semicircle,corresponds with and bears upon the face of the shaft, and a portion ofthe opening being curved and bearing on the entire outer face of thewedge, substantially as described.

The combination with a shaft,of a curved wedge secured against rotationthereon and having a face eccentric to said shaft, and a hub with anopening corresponding in part with and bearing on the face of the shaftand in part with and bearing on the entire outer eccentric face of thewedge, substantially as described.

4. The combination with a shaft,of a curved wedge secured againstrotation thereon and having a face eccentric to said shaft, and a hubwith an opening, a portion of which not exceeding a semicircle,corresponds with and bears on the face of the shaft and a portion of theopening being eccentrically curved and bearing on the entire outer faceof the wedge, substantially as described.

5. The combination with a cam-shaft having a series of eccentric bossesor wedges thereon arranged in different relative positions, of

cams having hubs withopenings corresponding in part with and bearing onthe face of the shaft and in part with and bearing on the entire outerfaces of the eccentric bosses or wedges, the width of the camsapproximating the width of the hubs, substantially as described.

In testimony whereof I have hereunto set my hand in the presence of twosubscribing witnesses.

EDWARD A. BLANTON, JR.

Witnesses:

GEO. G. HOWARD, EDWARD E. LAUDENSLAGER.

